[ios] Convert pref values to boolValue in setupModalViewControllerWithPrefs:

This transfers the correct boolean values stored in the prefs dictionary.

Bug: 1014959
Change-Id: I048a33f0d19456ba9c63382608aa443234d310a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1929812
Auto-Submit: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718087}

ios/chrome/browser/ui/infobars/modals/infobar_translate_table_view_controller.mm

@@ -161,9 +161,10 @@ typedef NS_ENUM(NSInteger, ItemType) {
 - (void)setupModalViewControllerWithPrefs:(NSDictionary*)prefs {
   self.sourceLanguage = prefs[kSourceLanguagePrefKey];
   self.targetLanguage = prefs[kTargetLanguagePrefKey];
-  self.shouldAlwaysTranslate = prefs[kShouldAlwaysTranslatePrefKey];
-  self.isTranslatableLanguage = prefs[kIsTranslatableLanguagePrefKey];
-  self.isSiteBlacklisted = prefs[kIsSiteBlacklistedPrefKey];
+  self.shouldAlwaysTranslate = [prefs[kShouldAlwaysTranslatePrefKey] boolValue];
+  self.isTranslatableLanguage =
+      [prefs[kIsTranslatableLanguagePrefKey] boolValue];
+  self.isSiteBlacklisted = [prefs[kIsSiteBlacklistedPrefKey] boolValue];
   [self.tableView reloadData];
 }